1. Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
2. Collaborative Innovation Center of Guangxi Biological Medicine, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
3. College of Public Hygiene, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China